Re: Prevent inode/dentry trashing?

[Michal Koutný]

Hello Phillip.

On Mon, Jun 07, 2021 at 02:39:35PM +0200, Philipp Hahn <pmhahn+lkml@xxxxxxxxx> wrote:
> The trashed caches affect all other processes running in parallel or the
> first processes started each morning.
> 
> Is it possible to prevent inode/dentry trashing for example by limiting the
> cache per process(-group)?

Yes. Unless you have disabled it with CONFIG_MEMCG_KMEM or
cgroup.memory=nokmem, dentries and inodes are charged to respective
cgroups. And you can limit overall memory of a cgroup, see
memory.{max,high} attributes. (You suggest this inode/dentry consumption
is dominant enough to affect other jobs, so the limit would keep it
constrained as you intend).

HTH,
Michal

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